The best replacement for ex640 is ex720.

The best alternatives to ex640 are rated as following:
★★★★★  ex720
★★★★★  bx450
★★★★  es6100
★★★★  ex645
★★★  samsung 6100
★★★  samsung es6100
★★  ex650
★  samsung eh6000
  ex620

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ex640
ex720
bx450